Remove drone.

Docker-DCO-1.1-Signed-off-by: Jessie Frazelle <princess@docker.com> (github: jfrazelle)

.drone.yml

@@ -1,14 +0,0 @@
-image: dockercore/docker
-env:
-  - AUTO_GOPATH=1
-  - DOCKER_GRAPHDRIVER=vfs
-  - DOCKER_EXECDRIVER=native
-script:
-# Setup the DockerInDocker environment.
-  - hack/dind
-# Tests relying on StartWithBusybox make Drone time out.
-  - rm integration-cli/docker_cli_daemon_test.go
-  - rm integration-cli/docker_cli_exec_test.go 
-# Validate and test.
-  - hack/make.sh validate-dco validate-gofmt validate-toml
-  - hack/make.sh binary cross test-unit test-integration-cli test-integration test-docker-py